Abstract:
According to a first aspect of the invention, there is provided a lithographic method of providing an alignment mark on a layer provided on a substrate, the method including providing the alignment mark on an area of the layer which is oriented within a certain range of angles with respect to a surface of the substrate on which the layer is provided.
Abstract:
In a lithographic apparatus, a slip of a patterning device relative to a support, the support being constructed to support the patterning device, may be provided by: measuring a position of the support relative to a structure of the lithographic apparatus; measuring a position of the patterning device relative to the structure of the lithographic apparatus; determining a correlation between the position of the patterning device and the position of the support; and deriving from the correlation a slip of the patterning device relative to the support. The structure may include a projection system to project a radiation beam patterned by the patterning device onto a target portion of the substrate. The projection system may be connected to a frame, such as a metrology frame of the lithographic apparatus.
Abstract:
A lithographic apparatus has a patterning support holding a patterning device. At least one position sensor measures a position of the patterning device relative to the patterning support, and generates a measuring signal. A positioning device controls a position of the patterning support on the basis of the measuring signal input to the positioning device. In a corresponding device manufacturing method a patterning support is provided. A patterning device is held on the patterning support. The patterning support is moved along a line of movement. A position of the patterning device relative to the patterning support is measured, and a position of the patterning support is controlled on the basis of the measurement of the position of the patterning device relative to the patterning support. Thus, the controlling of the position of the patterning support compensates for a slip of the patterning device relative to the patterning support.
Abstract:
To enable differentiation between a particle and a ghost particle, a detector system is presented. The detector system is configured to output at least two detector signals corresponding to an intensity of radiation being incident on the detector system. If radiation is received from a ghost particle, not all of the at least two detector signals has a level above a predetermined threshold level, whereas radiation received from a contaminating particle results in all signals having a level above a threshold level. Thus, it may be determined with a high accuracy whether a particle or a ghost particle is redirecting radiation towards the detector system.
Abstract:
A method of planning tasks to be performed in a machine derives a precedence graph by linking subsidiary tasks to a sequence of key tasks to create a scheduling problem that can be solved by an automated scheduler.
Abstract:
The invention relates to a lithographic projection assembly, having at least two load locks for transferring substrates between a first environment and a lower pressure second environment, a substrate handler with a handler chamber within the second environment and a lithographic projection apparatus including a projection chamber. The handler chamber and the projection chamber communicate via a load position for entering a substrate from the handler chanter into the projection chamber and an unload position for removing the substrate from the projection chamber into the handler chamber. The handler chamber also includes pre-processing means for pre-processing of the substrates and transport means for transferring substrates between the load locks and pre-processing means.
Abstract:
A method of controlling a track apparatus in a lithocell apparatus arrangement, is presented herein. The lithocell includes a lithographic exposure apparatus configured to expose substrates and a track apparatus configured to prepare substrates before exposure and develop substrates after exposure. The method includes predicting times at which the lithographic exposure apparatus will be available to accept a prepared substrate for exposure from the track apparatus, and adjusting a rate at which the track apparatus prepares substrates so that a substrate is prepared in time for acceptance by the lithographic exposure apparatus.
Abstract:
A method of controlling a track apparatus in a lithocell apparatus arrangement, is presented herein. The lithocell includes a lithographic exposure apparatus configured to expose substrates and a track apparatus configured to prepare substrates before exposure and develop substrates after exposure. The method comprises predicting times at which the lithographic exposure apparatus will be available to accept a prepared substrate for exposure from the track apparatus, and adjusting a rate at which the track apparatus prepares substrates so that a substrate is prepared in time for acceptance by the lithographic exposure apparatus. By adjusting the track rate so that substrates are ready just as the lithographic exposure apparatus needs them, the use of the buffer in the track can be largely avoided or even eliminated entirely.
Abstract:
A lithographic apparatus having an optical column capable of projecting a beam on a target portion on a substrate held by the substrate support. The optical column may have a self-emissive contrast device to emit the beam. The optical column may include a projection system to project the beam onto the target portion. The target portion has a height in a scanning direction of the substrate and a tangential width mainly perpendicular to the scanning direction, wherein a scanning speed of the substrate in the scanning direction divided by the height substantially corresponds with a rotating speed of the optical column or a part thereof divided by the tangential width of the target portion.
Abstract:
A substrate handling apparatus for handling a substrate is disclosed. The substrate handling apparatus includes a substrate feeding device to feed the substrate towards an exposure area, a substrate receiving device to receive the substrate from the exposure area, and a substrate stabilization device to maintain, at least in the exposure area, the substrate substantially flat at an exposure height and/or tilt, the substrate stabilization device configured for contactless stabilization of the flexible substrate.